1 # SPDX-License-Identifier: GPL-2.0-only
2 %YAML 1.2
3 ---
4 $id: http://devicetree.org/schemas/i2c/i2c-mux
5 $schema: http://devicetree.org/meta-schemas/co
6
7 title: Pinctrl-based I2C Bus Mux
8
9 maintainers:
10 - Wolfram Sang <wsa@kernel.org>
11
12 description: |
13 This binding describes an I2C bus multiplexe
14 signals, and represents the pin multiplexing
15 bindings.
16
17 +-----+ +---
18 | dev | | de
19 +------------------------+ +-----+ +---
20 | SoC | | |
21 | /----|------+--------+
22 | +---+ +------+ | child bus A, on
23 | |I2C|---|Pinmux| |
24 | +---+ +------+ | child bus B, on
25 | \----|------+--------+
26 | | | |
27 +------------------------+ +-----+ +----
28 | dev | | dev
29 +-----+ +----
30
31 For each named state defined in the pinctrl-
32 I2C child bus numbers are assigned based on
33
34 The only exception is that no bus will be cr
35 defined, it must be the last entry in pinctr
36
37 pinctrl-names = "ddc", "pta", "idle" ->
38 pinctrl-names = "ddc", "idle", "pta" ->
39 pinctrl-names = "idle", "ddc", "pta" ->
40
41 Whenever an access is made to a device on a
42 programmed into hardware.
43
44 If an idle state is defined, whenever an acc
45 the idle pinctrl state will be programmed in
46
47 If an idle state is not defined, the most re
48 into hardware whenever no access is being ma
49
50 properties:
51 compatible:
52 const: i2c-mux-pinctrl
53
54 i2c-parent:
55 $ref: /schemas/types.yaml#/definitions/pha
56 description: The phandle of the I2C bus th
57 to.
58
59 allOf:
60 - $ref: i2c-mux.yaml
61
62 unevaluatedProperties: false
63
64 required:
65 - compatible
66 - i2c-parent
67
68 examples:
69 - |
70 i2cmux {
71 compatible = "i2c-mux-pinctrl";
72 #address-cells = <1>;
73 #size-cells = <0>;
74
75 i2c-parent = <&i2c1>;
76
77 pinctrl-names = "ddc", "pta", "idle";
78 pinctrl-0 = <&state_i2cmux_ddc>;
79 pinctrl-1 = <&state_i2cmux_pta>;
80 pinctrl-2 = <&state_i2cmux_idle>;
81
82 i2c@0 {
83 reg = <0>;
84 #address-cells = <1>;
85 #size-cells = <0>;
86
87 eeprom@50 {
88 compatible = "atmel,24c02";
89 reg = <0x50>;
90 };
91 };
92
93 i2c@1 {
94 reg = <1>;
95 #address-cells = <1>;
96 #size-cells = <0>;
97
98 eeprom@50 {
99 compatible = "atmel,24c02";
100 reg = <0x50>;
101 };
102 };
103 };
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